package com.chen.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.chen.reggie.common.BaseContext;
import com.chen.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * 检查用户是否完成登录
 */
@Slf4j
@WebFilter(filterName = "loginCheckFilter", urlPatterns = "/*")
public class LoginCheckFilter implements Filter {

    //路径匹配器
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();


    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        String requestURI = request.getRequestURI();

        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/user/sendMsg",
                "/user/login"
        };

        if (check(urls, requestURI)) {
            filterChain.doFilter(request, response);
            return;
        }
        //后台用户登陆验证
        Long empId = (Long) request.getSession().getAttribute("employee");
        if (empId != null) {
            BaseContext.setCurrentId(empId);
            filterChain.doFilter(request, response);
            return;
        }
        //移动端用户登录验证
        Long userId = (Long) request.getSession().getAttribute("user");
        if (userId != null) {
            BaseContext.setCurrentId(userId);
            filterChain.doFilter(request, response);
            return;
        }

        //通过输出流方式向客户端页面响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));

    }

    public boolean check(String[] urls, String requestUri) {
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestUri);
            if (match) {
                return true;
            }
        }
        return false;
    }
}
